Computing-chart.



Patented sept. 3o, :9x12v` CUMPUTING CHART.

(Application led Nov. 19,l 1901.)

(No Model.)

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UNITED STATES PATENT OFFICE.

LISTON B. MANLEY, OF DULUTI-I, MINNESOTA.

COMPUTING-CHART.

SPECIFICATION forming part of Letters Patent No. 710,288, dated September 30, 1902.

To @ZZ whom it 711,603/ concern:

Be Iit known that I, LISTON B. MANLEY, a citizen of the United States, and a resident of Duluth, in the county of St. Louis and State of Minnesota, have invented a new and Improved OomputingOhart, ot' which the following is a full, clear, and exact description.

This invention relates to improvements in computing-charts, particularly adapted for use in insurance-oifices, banks, and the like, the object being to provide a simple chart by means of which the number of days between any two given dates may be quickly ascertained and indicating the per cent. of an annual premium earned by a policy for the said number of days, and, further, to provide in connection with the device indices referring to numbered lines in cancellation-tables.

I will describe a computing-chart embodying` my invention and then point out the novel features in the appended claim.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of referenceindicate corresponding parts in both figures.

Figure l is a plan view of a computing-chart embodying my invention, and Fig. 2 is a section on the line 2 2 of Fig. l.

As shown in the drawings, the chart comprises a member 5 and a member 6. These members are shown as circular, the member 5 being adapted to rotate within the member (i, and both members are mounted to rotate on a post 7, attached to a base S. A sleeve is secu red to the member 6 and extends loosely through the member 5,the sleeve being mounted to turn on the post.` A washer 7' is arranged on the upper end of the sleeve and engages a recess in the upper face ot' the member 5, and a headed bolt 8' engages a screwthreaded opening in the upper end of the post. The parts 5 and G may be made of any suitable material, and preferably, as shown in Fig. 2, the part or member G is provided with a recess or depression within which the y part or member 5 is placed, so that the upper surfaces of the two members are on one plane.

Printed or otherwise marked on the inner member 5 are the several months of the year, and opposite each designation of a month is a series of figures indicating the number of days in the month. These figures are shown at 9,

Application filed November 19, 1901. Serial No. 82,855. (Noimodel.)

and each set of figures indicating a month is embraced within a bracket or line l0. On the inner periphery of the outer member G are consecutively arranged figures running from l to 365, and this line of figures I designate the days-in-force numerals. The several figures ll, indicating the days in force, are divided into several sections, the sections being indicated by brackets or lines l2, and opposite the center of each bracket or line l2 is arranged a figure 13, indicating the per cent. earned, and opposite each of said figures 13 is a numeral or numerals 1l, which serve as indices referring to numbered lilies in a cancellation-table.

The operation ofthe device above described is as follows: Set any given date indicated on the outer margin of the inner circle or member 5 in line with the numeral 365 at the inner margin ot' the outer circle or member,

and the difference in days between the first.

date named and the other date taken is shown opposite the last-named date on the inner margin of the outer circle or member 6. For instance, as shown in Fig. l, place September 14 in line with 365 on the scale Il, then turn to March 15. Opposite this number 15 will be found the numeral 182, showing that there are one hundred and eighty-two days between September 14 and March 15, In case February 29 of a leapyear occurs within the period for which the time is to be computed instead of setting the first date opposite 365 set it opposite 364, and the correct number of days between the two dates will appear in the adjoining circle, as in the previous instance.

Instead of the figures representing the per cent. earned an interest-table may be emvployed.

For convenience in turning the member 5 relatively to the member 6 the said member 6 is provided in its bottom wall with an opening 20, through which a person may insert his finger to engage the under side of the inner member.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- A computing-chart having an outer or lower circular member and an upper or inner circular -member movable one relatively to the IOO 2` l iHome other, one of said members having indices of the inner member, and aheaded bolt soreW- indicating months and dates thereof and the ing into the upper end of the post, substanother member having a. series of conseeutially as specified. tively-arranged numbers, a central support- In testimony whereof I have signed my 5 ing-base, a post secured on said base, a sleeve name to this specification in the presence of 15 secured to the outer or lower member and two subsoribing Witnesses. mounted to turn on said, post,'the said sleeve LISTON B. MANLEY. extending loosely through the upper or inner Witnesses: v member, a Washer ou the upper end of the L. D. SCHENCK,

. 1o sleeve and engaging a recess in the upper face E. F. SPINK. 

